US20080203834A1 - Motor Used to Drive Optical Elements - Google Patents

Motor Used to Drive Optical Elements Download PDF

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Publication number
US20080203834A1
US20080203834A1 US11/915,985 US91598506A US2008203834A1 US 20080203834 A1 US20080203834 A1 US 20080203834A1 US 91598506 A US91598506 A US 91598506A US 2008203834 A1 US2008203834 A1 US 2008203834A1
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US
United States
Prior art keywords
optical elements
motor used
drive optical
encoder
rotor
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Granted
Application number
US11/915,985
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US7683512B2 (en
Inventor
Yun-Feng Gao
You-Yong Liao
Guang-Neng Wang
Xiao-Hui Fu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Hans Precision Mechatronics Co Ltd
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Shenzhen Hans Precision Mechatronics Co Ltd
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Assigned to SHENZHEN HAN'S PRECISION MECHATRONICS CO., LTD. reassignment SHENZHEN HAN'S PRECISION MECHATRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FU, XIAO-HUI, GAO, YUN-FENG, LIAO, YOU-YONG, WANG, GUANG-NENG
Publication of US20080203834A1 publication Critical patent/US20080203834A1/en
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Publication of US7683512B2 publication Critical patent/US7683512B2/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K33/00Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/16Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K11/00Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21Devices for sensing speed or position, or actuated thereby

Definitions

  • the present invention relates to a motor, and in particular to a motor used to drive optical elements such as mirrors for the purpose of guiding light beams in laser marker, scanners or other systems which are similar to these.
  • a motor used to drive optical elements usually has different structure and configuration.
  • the position feedback apparatus of the motor used to drive optical elements utilizes a capacitive type transducer or an inductance type transducer.
  • the accuracy, the repeatability and the stability of the motor are restricted greatly for the drift of the transducer.
  • the motor includes two magnetic poles and the motor is supported by ball bearings. The motor's response/(the response of the motor) is restricted because of the small ratio of torque and inertia.
  • the running accuracy is influenced by the low axial stiffness.
  • An object of the present invention is to provide a motor used to drive optical elements which is controlled by a encoder so as to eliminate the instability of the system caused by the drift of the conventional transducer. At the same time, it is in order to improve the motor's capability so as to improve the system's response, positioning and repeatability.
  • a motor used to drive optical elements comprises a stator, a rotor revolved relative to the stator, and a feedback apparatus used to sense the position of the rotor.
  • the feedback apparatus is an encoder.
  • the motor used to drive optical elements wherein the encoder is a round encoder and the encoder includes an encoding disk droved by the rotor and a readheader cooperated to the encoding disk.
  • the motor used to drive optical elements wherein the encoder is a linear encoder and the encoder includes a linear scale mounted on the outer surface of a columnar seat which connects with the rotor and a readheader cooperated to the linear scale.
  • the motor used to drive optical elements wherein the readheader includes an emitter and a receiver.
  • stator includes a magnetic yoke, a bobbin and a plurality of multipole coils set on the bobbin.
  • the motor used to drive optical elements wherein the bobbin and the multipole coils are inserted into the magnetic yoke and shaped together by pouring epoxy resin.
  • the motor used to drive optical elements wherein the rotor is a multipolar rotor and includes a shaft, a plurality of bearings and a plurality of magnets whose polarities are arranged alternately on the shaft.
  • the motor used to drive optical elements wherein the shaft includes a main body which is made of a highly magnetic material and a pair of nonmagnetic extended portion which extend from the two end of the main body, the magnets are mounted on the main body.
  • the motor used to drive optical elements wherein the bearings are angular contact ball bearings and installed on the extended portion.
  • the motor used to drive optical elements wherein a pin is defined on one of the extended portions and lies on the outer side of the bearing.
  • the invention utilizes the encoder so as to eliminate the drift caused by transducer and also utilizes the multipole motor to drive the load so that the load will move fast and smoothly.
  • the capability of the system is improved greatly.
  • FIG. 1 is a perspective assembled view of a motor used to drive optical elements according to the invention
  • FIG. 2 is a perspective view of a stator of the motor used to drive optical elements according to the invention
  • FIG. 3 is a assembled view of a bobbin and coils of the stator of the motor used to drive optical elements according to the invention
  • FIG. 4 is a perspective view of a rotor of the motor used to drive optical elements according to the invention.
  • FIG. 5 is another view of the rotor of the motor used to drive optical elements according to the invention.
  • FIG. 6 is a sectional view of a position feedback apparatus of the motor used to drive optical elements in one embodiment according to the invention.
  • FIG. 7 is a sectional view of the position feedback apparatus of the motor used to drive optical elements in another embodiment according to the invention.
  • the motor 1 used drive optical elements includes a stator 2 and a rotor 3 revolved relative to the stator 2 .
  • the stator 2 includes coils 5 , a bobbin 6 and a magnetic yoke 7 .
  • the bobbin 6 is made of nonmagnetic material.
  • a plurality of slots are defined on the bobbin 6 .
  • Each coil 5 is placed into the slot respectively after it is shaped and the coils 5 form the motor winding by connected in certain sequence.
  • the coils 5 and the bobbin 6 are inserted into the magnetic yoke 7 and shaped together by pouring epoxy resin.
  • the rotor 3 includes a plurality of magnets 8 , a shaft 9 and a pair of bearings 10 .
  • the magnets 8 whose polarity is alternately arranged are affixed on the shaft 9 .
  • the shaft 9 includes a main body (not show in the FIGS) which is covered by the magnets 8 and a pair of extended portion 11 , 12 which extend from the two end of the main body.
  • the main body is made of a material which has a high magnetic permeability and the extended portion 11 , 12 are made of nonmagnetic material.
  • the bearings 10 are angular contact ball bearings and installed on the extended portion 11 , 12 .
  • a spring 13 is installed on the extended portion 12 and lies on the inner side of the bearing 10 so as to provide a constant preload.
  • a load (mirror) is installed on the extended portion 12 too.
  • a pin 14 is defined on the extended portion 12 and lies on the outer side of the bearing 10 so as to limit the rotating angle of the motor.
  • the rotor 3 and the stator 2 are oriented accurately by bearing pedestals 19 , 20 of the bearings 10 .
  • the magnetic field of the rotor 3 interacts with the stator 2 and produce a torque when the stator 2 is energized so that the rotor 3 drive the load 4 rotating in the stator 2 .
  • the stator 2 is energized with alternating current, the rotor 3 will rotate reciprocally in the stator 2 .
  • An encoder is a round encoder in this embodiment.
  • the encoder includes an encoding disk 15 installed on the extended portion 11 and driven by the shaft 9 and a readheader 16 cooperated to the encoding disk 15 .
  • the gap between the readheader 16 and the encoding disk 15 is adjusted by an encoding seat 17 and the bearing pedestal 20 and also protected by an end shield 18 .
  • the encoding disk 15 is grated uniformly.
  • a luminous organ (infrared light emitting diode) installed on the readheader 16 emits light to the surface of the encoding disk 15 and then the light is reflected to the receiver of the readheader.
  • Position signal of the motor is picked off by the receiver of the readheader.
  • the motion of the rotor 3 or the load 4 is precisely controlled by a feedback control system which is consisted of the encoder.
  • FIG. 7 is a sectional view of the feedback apparatus of the motor used to drive optical elements in another embodiment according to the invention.
  • the encoder is a linear encoder in this embodiment.
  • the encoder includes a linear scale 21 mounted on the outer surface of a columnar seat 22 which connects with the extended portion 11 and a readheader 23 cooperated to the linear scale 21 .
  • the angular position of the rotor 3 is measured by the readheader 23 on the radial direction.
  • the motor used to used to drive optical elements utilizes such described structure so as to eliminate the system's instability caused by the drift of the conventional capacitive type transducer or an inductance type transducer. Moreover, the response of the motor used to drive optical elements has been improved greatly by utilizing multipole motor.
  • the motor used to drive optical elements described above utilizes a multiple pole stator consisting of multiple pole winding and multiple pole rotor consisting of a plurality of magnets.
  • the stator and the rotor can also be two poles if the motor satisfies the system requirements.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Brushless Motors (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

A motor used to drive optical elements includes a stator, a rotor revolved relative to the stator, and a feedback apparatus used to sense the position of the rotor. The feedback apparatus is an encoder. The invention utilizes such described structure so as to eliminate the system's instability caused by the drift of the conventional capacitive type transducer or an inductance type transducer. Moreover, the response of the motor used to drive optical elements has been improved greatly by utilizing multipole motor.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates to a motor, and in particular to a motor used to drive optical elements such as mirrors for the purpose of guiding light beams in laser marker, scanners or other systems which are similar to these.
  • 2. The Related Art
  • A motor used to drive optical elements usually has different structure and configuration. Traditionally, the position feedback apparatus of the motor used to drive optical elements utilizes a capacitive type transducer or an inductance type transducer. However, the accuracy, the repeatability and the stability of the motor are restricted greatly for the drift of the transducer. Moreover, the motor includes two magnetic poles and the motor is supported by ball bearings. The motor's response/(the response of the motor) is restricted because of the small ratio of torque and inertia. And also, the running accuracy is influenced by the low axial stiffness.
  • SUMMARY OF THE INVENTION
  • An object of the present invention is to provide a motor used to drive optical elements which is controlled by a encoder so as to eliminate the instability of the system caused by the drift of the conventional transducer. At the same time, it is in order to improve the motor's capability so as to improve the system's response, positioning and repeatability.
  • In order to achieve such aims, the design of the invention will be described in the follow paragraphs.
  • A motor used to drive optical elements comprises a stator, a rotor revolved relative to the stator, and a feedback apparatus used to sense the position of the rotor. The feedback apparatus is an encoder.
  • The motor used to drive optical elements, wherein the encoder is a round encoder and the encoder includes an encoding disk droved by the rotor and a readheader cooperated to the encoding disk.
  • The motor used to drive optical elements, wherein the encoder is a linear encoder and the encoder includes a linear scale mounted on the outer surface of a columnar seat which connects with the rotor and a readheader cooperated to the linear scale.
  • The motor used to drive optical elements, wherein the readheader includes an emitter and a receiver.
  • The motor used to drive optical elements, wherein the stator includes a magnetic yoke, a bobbin and a plurality of multipole coils set on the bobbin.
  • The motor used to drive optical elements, wherein the bobbin and the multipole coils are inserted into the magnetic yoke and shaped together by pouring epoxy resin.
  • The motor used to drive optical elements, wherein the rotor is a multipolar rotor and includes a shaft, a plurality of bearings and a plurality of magnets whose polarities are arranged alternately on the shaft.
  • The motor used to drive optical elements, wherein the shaft includes a main body which is made of a highly magnetic material and a pair of nonmagnetic extended portion which extend from the two end of the main body, the magnets are mounted on the main body.
  • The motor used to drive optical elements, wherein the bearings are angular contact ball bearings and installed on the extended portion.
  • The motor used to drive optical elements, wherein a pin is defined on one of the extended portions and lies on the outer side of the bearing.
  • As described hereinabove, the invention utilizes the encoder so as to eliminate the drift caused by transducer and also utilizes the multipole motor to drive the load so that the load will move fast and smoothly. The capability of the system is improved greatly.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The exact nature of this invention, as well as other objects and advantages thereof, will be readily apparent from consideration of the following specification relating to the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof and wherein:
  • FIG. 1 is a perspective assembled view of a motor used to drive optical elements according to the invention;
  • FIG. 2 is a perspective view of a stator of the motor used to drive optical elements according to the invention;
  • FIG. 3 is a assembled view of a bobbin and coils of the stator of the motor used to drive optical elements according to the invention;
  • FIG. 4 is a perspective view of a rotor of the motor used to drive optical elements according to the invention;
  • FIG. 5 is another view of the rotor of the motor used to drive optical elements according to the invention;
  • FIG. 6 is a sectional view of a position feedback apparatus of the motor used to drive optical elements in one embodiment according to the invention; and
  • FIG. 7 is a sectional view of the position feedback apparatus of the motor used to drive optical elements in another embodiment according to the invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • Detailed description will hereunder be given of the preferred embodiment of a motor used to drive optical elements according to the present invention with reference to the accompanying drawings.
  • As show in FIG. 1 to FIG. 6, the motor 1 used drive optical elements includes a stator 2 and a rotor 3 revolved relative to the stator 2. The stator 2 includes coils 5, a bobbin 6 and a magnetic yoke 7. The bobbin 6 is made of nonmagnetic material. A plurality of slots are defined on the bobbin 6. Each coil 5 is placed into the slot respectively after it is shaped and the coils 5 form the motor winding by connected in certain sequence. The coils 5 and the bobbin 6 are inserted into the magnetic yoke 7 and shaped together by pouring epoxy resin. The rotor 3 includes a plurality of magnets 8, a shaft 9 and a pair of bearings 10. The magnets 8 whose polarity is alternately arranged are affixed on the shaft 9. The shaft 9 includes a main body (not show in the FIGS) which is covered by the magnets 8 and a pair of extended portion 11, 12 which extend from the two end of the main body. The main body is made of a material which has a high magnetic permeability and the extended portion 11, 12 are made of nonmagnetic material. The bearings 10 are angular contact ball bearings and installed on the extended portion 11, 12. A spring 13 is installed on the extended portion 12 and lies on the inner side of the bearing 10 so as to provide a constant preload. A load (mirror) is installed on the extended portion 12 too. A pin 14 is defined on the extended portion 12 and lies on the outer side of the bearing 10 so as to limit the rotating angle of the motor. The rotor 3 and the stator 2 are oriented accurately by bearing pedestals 19, 20 of the bearings 10.
  • The magnetic field of the rotor 3 interacts with the stator 2 and produce a torque when the stator 2 is energized so that the rotor 3 drive the load 4 rotating in the stator 2. When the stator 2 is energized with alternating current, the rotor 3 will rotate reciprocally in the stator 2.
  • An encoder is a round encoder in this embodiment. The encoder includes an encoding disk 15 installed on the extended portion 11 and driven by the shaft 9 and a readheader 16 cooperated to the encoding disk 15. The gap between the readheader 16 and the encoding disk 15 is adjusted by an encoding seat 17 and the bearing pedestal 20 and also protected by an end shield 18. The encoding disk 15 is grated uniformly. A luminous organ (infrared light emitting diode) installed on the readheader 16 emits light to the surface of the encoding disk 15 and then the light is reflected to the receiver of the readheader. Position signal of the motor is picked off by the receiver of the readheader. The motion of the rotor 3 or the load 4 is precisely controlled by a feedback control system which is consisted of the encoder.
  • As the show in FIG. 7, the FIG. 7 is a sectional view of the feedback apparatus of the motor used to drive optical elements in another embodiment according to the invention. The encoder is a linear encoder in this embodiment. The encoder includes a linear scale 21 mounted on the outer surface of a columnar seat 22 which connects with the extended portion 11 and a readheader 23 cooperated to the linear scale 21. The angular position of the rotor 3 is measured by the readheader 23 on the radial direction.
  • The motor used to used to drive optical elements according to the invention utilizes such described structure so as to eliminate the system's instability caused by the drift of the conventional capacitive type transducer or an inductance type transducer. Moreover, the response of the motor used to drive optical elements has been improved greatly by utilizing multipole motor.
  • The motor used to drive optical elements described above utilizes a multiple pole stator consisting of multiple pole winding and multiple pole rotor consisting of a plurality of magnets. In fact, the stator and the rotor can also be two poles if the motor satisfies the system requirements.
  • It is to be understood, however, that even though numerous, characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosed is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.

Claims (18)

1. A motor used to drive optical elements comprising: a stator; a rotor revolved relative to the stator; and a feedback apparatus used to sense the position of the rotor, the feedback apparatus is an encoder.
2. The motor used to drive optical elements as claimed in claim 1, wherein the encoder is a round encoder and the encoder includes an encoding disk driven by the rotor and a readheader cooperated to the encoding disk.
3. The motor used to drive optical elements as claimed in claim 1, wherein the encoder is a linear encoder and the encoder includes a linear scale mounted on the outer surface of a columnar seat which connects with the rotor and a readheader cooperated to the linear scale.
4. The motor used to drive optical elements as claimed in claim 3, wherein the readheader includes an emitter and a receiver.
5. The motor used to drive optical elements as claimed in claim 4, wherein the stator includes a magnetic yoke, a bobbin and a plurality of coils set on the bobbin.
6. The motor used to drive optical elements as claimed in claim 5, wherein the bobbin and the coils are inserted into the magnetic yoke and shaped together by pouring epoxy resin.
7. The motor used to drive optical elements as claimed in claim 6, wherein the rotor includes a shaft, a plurality of bearings and a plurality of magnets whose polarity is alternately arranged on the shaft.
8. The motor used to drive optical elements as claimed in claim 7, wherein the shaft includes a main body which is made of a highly magnetic material and a pair of nonmagnetic extended portion which extend from the two ends of the main body, the magnets are mounted on the main body.
9. The motor used to drive optical elements as claimed in claim 8, wherein the bearings are angular contact ball bearings and installed on the extended portion.
10. The motor used to drive optical elements as claimed in claim 9, wherein a pin is defined on one of the extended portions and lies on the outer side of the bearing.
11. The motor used to drive optical elements as claimed in claim 2, wherein the readheader includes an emitter and a receiver.
12. The motor used to drive optical elements as claimed in claim 2, wherein the readheader includes an emitter and a receiver.
13. The motor used to drive optical elements as claimed in claim 11, wherein the stator includes a magnetic yoke, a bobbin and a plurality of coils set on the bobbin.
14. The motor used to drive optical elements as claimed in claim 11, wherein the bobbin and the coils are inserted into the magnetic yoke and shaped together by pouring epoxy resin.
15. The motor used to drive optical elements as claimed in claim 11, wherein the rotor includes a shaft, a plurality of bearings and a plurality of magnets whose polarity is alternately arranged on the shaft.
16. The motor used to drive optical elements as claimed in claim 11, wherein the shaft includes a main body which is made of a highly magnetic material and a pair of nonmagnetic extended portion which extend from the two ends of the main body, the magnets are mounted on the main body.
17. The motor used to drive optical elements as claimed in claim 11, wherein the bearings are angular contact ball bearings and installed on the extended portion.
18. The motor used to drive optical elements as claimed in claim 11, wherein a pin is defined on one of the extended portions and lies on the outer side of the bearing.
US11/915,985 2006-05-29 2006-07-06 Motor used to drive optical elements Expired - Fee Related US7683512B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN200610035684 2006-05-29
CN200610035684 2006-05-29
CN200610035684.4 2006-05-29
PCT/CN2006/001588 WO2007137459A1 (en) 2006-05-29 2006-07-06 A vibrating mirror motor

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US20080203834A1 true US20080203834A1 (en) 2008-08-28
US7683512B2 US7683512B2 (en) 2010-03-23

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DE (1) DE112006001827T5 (en)
WO (1) WO2007137459A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017537319A (en) * 2014-11-27 2017-12-14 シャンハイ マイクロ エレクトロニクス イクイプメント(グループ)カンパニー リミティド Amplitude monitor system, focusing leveling device, and defocus amount detection method
CN111884432A (en) * 2020-08-31 2020-11-03 广东美的智能科技有限公司 Motor and servo control system with same
CN112821703A (en) * 2020-12-30 2021-05-18 横川机器人(深圳)有限公司 Disk type motor

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EP2136456B1 (en) * 2008-06-19 2012-09-12 SICK STEGMANN GmbH Component kit - servo motor
JP5304464B2 (en) * 2008-09-11 2013-10-02 株式会社安川電機 Motor with encoder
CN107139019A (en) * 2017-05-24 2017-09-08 上海嘉幸自动化设备科技有限公司 A kind of electronic cylinder structure controlled for machine tool accuracy
CN111552211B (en) * 2020-05-18 2021-03-09 北京理工大学 Synchronous control method and system for laser test of optical engine

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US3464519A (en) * 1968-03-29 1969-09-02 Forrest B Whisler Adjustable scaffold
US3889778A (en) * 1973-07-26 1975-06-17 Gerald Dean Dotts Platform lift
US4619346A (en) * 1983-07-11 1986-10-28 Comabi S.A. Elevator-type work platform
US5850892A (en) * 1997-01-23 1998-12-22 Genie Industries, Inc. Personnel lift with adjustable shim wear blocks
US20040124733A1 (en) * 2002-12-25 2004-07-01 Noriaki Yamamoto Rotating electric machine, motor-driven vehicle and resin insert-molding method
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
JP2017537319A (en) * 2014-11-27 2017-12-14 シャンハイ マイクロ エレクトロニクス イクイプメント(グループ)カンパニー リミティド Amplitude monitor system, focusing leveling device, and defocus amount detection method
CN111884432A (en) * 2020-08-31 2020-11-03 广东美的智能科技有限公司 Motor and servo control system with same
CN112821703A (en) * 2020-12-30 2021-05-18 横川机器人(深圳)有限公司 Disk type motor

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US7683512B2 (en) 2010-03-23
DE112006001827T5 (en) 2008-05-08

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